Lab.gruppen PLM 20000Q - Manual (Page 33)

Quick Start Tutorial
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PLM Series Quick Start and Field Reference Guide Rev 1.3.5
40. From I/O CONFIG, tap EVENTS & CONTROL and navigate to the STATUS tab. Slowly increase the
attenuation faders to turn up the amplifier channels. If the PLM is connected to loudspeaker, audio
should now be heard.
41. Use the powerful XOVER, AUX, PEQ and GEQ screens to tune your loudspeaker as required. Please
refer to the Lake Controller Operation Manual for detailed information on these features.
6.5 Gain Structure
The PLM Series architecture provides gain adjustments at various points in the signal path and therefore,
various places for muting and level adjustment. Each mute or gain adjustment point serves a different
purpose.
Detailed information on signal flow and gain structure is available in the PLM Series Operation Manual.
The signal flow diagrams show in chapter 5 are useful signal path references, and the following sections
describe the various adjustment points, all of which are available via the Lake Controller software.
6.5.1 Input Headroom (Analog Inputs Only)
Input Headroom should be set to 12 dBu if the source can be limited to 12 dBu; otherwise it should be set to
26 dBu. This setting does not affect the other gain stages, or the overall noise floor; it allows control of the
appropriate headroom at the input stage only.
6.5.2 Input Mixer
Input Mixer gains can remain at 0.00 dB for most configurations; if only one input channel is used per
Module, the other can be set to -INF.
6.5.3 Module Input Gain
Input Gain is used to adjust the level between different speaker cabinets in the system. This gain can remain
at 0.00 dB unless a lower level is required for the cabinet/s driven by this Module.
6.5.4 Module Output Gain (Levels)
Factory and User Gain are provided for each Module output. These two stages provide a level of security
and control for the system designer (Factory) and a further level of adjustment for the user (User), both of
which combine to balance the level between frequency bands in a multi-way crossover.
Generally, output gain values are configured within a Module / loudspeaker preset file and should not need
to be adjusted further.